1258 lines
35 KiB
C
1258 lines
35 KiB
C
/*
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* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Private thread definitions for the uthread kernel.
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*
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* $FreeBSD$
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*/
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#ifndef _PTHREAD_PRIVATE_H
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#define _PTHREAD_PRIVATE_H
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/*
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* Evaluate the storage class specifier.
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*/
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#ifdef GLOBAL_PTHREAD_PRIVATE
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#define SCLASS
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#else
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#define SCLASS extern
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#endif
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/*
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* Include files.
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*/
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#include <setjmp.h>
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#include <signal.h>
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#include <sys/queue.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/cdefs.h>
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#include <sched.h>
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#include <spinlock.h>
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#include <pthread_np.h>
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/*
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* Kernel fatal error handler macro.
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*/
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#define PANIC(string) _thread_exit(__FILE__,__LINE__,string)
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/* Output debug messages like this: */
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#define stdout_debug(_x) _thread_sys_write(1,_x,strlen(_x));
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#define stderr_debug(_x) _thread_sys_write(2,_x,strlen(_x));
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/*
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* Priority queue manipulation macros (using pqe link):
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*/
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#define PTHREAD_PRIOQ_INSERT_HEAD(thrd) _pq_insert_head(&_readyq,thrd)
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#define PTHREAD_PRIOQ_INSERT_TAIL(thrd) _pq_insert_tail(&_readyq,thrd)
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#define PTHREAD_PRIOQ_REMOVE(thrd) _pq_remove(&_readyq,thrd)
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#define PTHREAD_PRIOQ_FIRST() _pq_first(&_readyq)
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/*
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* Waiting queue manipulation macros (using pqe link):
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*/
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#if defined(_PTHREADS_INVARIANTS)
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#define PTHREAD_WAITQ_REMOVE(thrd) _waitq_remove(thrd)
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#define PTHREAD_WAITQ_INSERT(thrd) _waitq_insert(thrd)
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#define PTHREAD_WAITQ_CLEARACTIVE() _waitq_clearactive()
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#define PTHREAD_WAITQ_SETACTIVE() _waitq_setactive()
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#else
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#define PTHREAD_WAITQ_REMOVE(thrd) do { \
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TAILQ_REMOVE(&_waitingq,thrd,pqe); \
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(thrd)->flags &= ~PTHREAD_FLAGS_IN_WAITQ; \
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} while (0)
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#define PTHREAD_WAITQ_INSERT(thrd) do { \
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if ((thrd)->wakeup_time.tv_sec == -1) \
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TAILQ_INSERT_TAIL(&_waitingq,thrd,pqe); \
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else { \
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pthread_t tid = TAILQ_FIRST(&_waitingq); \
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while ((tid != NULL) && (tid->wakeup_time.tv_sec != -1) && \
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((tid->wakeup_time.tv_sec < (thrd)->wakeup_time.tv_sec) || \
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((tid->wakeup_time.tv_sec == (thrd)->wakeup_time.tv_sec) && \
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(tid->wakeup_time.tv_nsec <= (thrd)->wakeup_time.tv_nsec)))) \
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tid = TAILQ_NEXT(tid, pqe); \
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if (tid == NULL) \
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TAILQ_INSERT_TAIL(&_waitingq,thrd,pqe); \
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else \
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TAILQ_INSERT_BEFORE(tid,thrd,pqe); \
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} \
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(thrd)->flags |= PTHREAD_FLAGS_IN_WAITQ; \
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} while (0)
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#define PTHREAD_WAITQ_CLEARACTIVE()
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#define PTHREAD_WAITQ_SETACTIVE()
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#endif
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/*
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* Work queue manipulation macros (using qe link):
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*/
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#define PTHREAD_WORKQ_INSERT(thrd) do { \
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TAILQ_INSERT_TAIL(&_workq,thrd,qe); \
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(thrd)->flags |= PTHREAD_FLAGS_IN_WORKQ; \
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} while (0)
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#define PTHREAD_WORKQ_REMOVE(thrd) do { \
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TAILQ_REMOVE(&_workq,thrd,qe); \
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(thrd)->flags &= ~PTHREAD_FLAGS_IN_WORKQ; \
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} while (0)
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/*
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* State change macro without scheduling queue change:
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*/
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#define PTHREAD_SET_STATE(thrd, newstate) do { \
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(thrd)->state = newstate; \
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(thrd)->fname = __FILE__; \
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(thrd)->lineno = __LINE__; \
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} while (0)
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/*
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* State change macro with scheduling queue change - This must be
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* called with preemption deferred (see thread_kern_sched_[un]defer).
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*/
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#if defined(_PTHREADS_INVARIANTS)
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#define PTHREAD_NEW_STATE(thrd, newstate) do { \
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if (_thread_kern_new_state != 0) \
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PANIC("Recursive PTHREAD_NEW_STATE"); \
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_thread_kern_new_state = 1; \
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if ((thrd)->state != newstate) { \
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if ((thrd)->state == PS_RUNNING) { \
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PTHREAD_PRIOQ_REMOVE(thrd); \
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PTHREAD_WAITQ_INSERT(thrd); \
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} else if (newstate == PS_RUNNING) { \
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PTHREAD_WAITQ_REMOVE(thrd); \
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PTHREAD_PRIOQ_INSERT_TAIL(thrd); \
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} \
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} \
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_thread_kern_new_state = 0; \
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PTHREAD_SET_STATE(thrd, newstate); \
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} while (0)
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#else
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#define PTHREAD_NEW_STATE(thrd, newstate) do { \
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if ((thrd)->state != newstate) { \
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if ((thrd)->state == PS_RUNNING) { \
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PTHREAD_PRIOQ_REMOVE(thrd); \
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PTHREAD_WAITQ_INSERT(thrd); \
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} else if (newstate == PS_RUNNING) { \
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PTHREAD_WAITQ_REMOVE(thrd); \
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PTHREAD_PRIOQ_INSERT_TAIL(thrd); \
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} \
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} \
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PTHREAD_SET_STATE(thrd, newstate); \
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} while (0)
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#endif
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/*
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* Define the signals to be used for scheduling.
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*/
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#if defined(_PTHREADS_COMPAT_SCHED)
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#define _ITIMER_SCHED_TIMER ITIMER_VIRTUAL
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#define _SCHED_SIGNAL SIGVTALRM
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#else
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#define _ITIMER_SCHED_TIMER ITIMER_PROF
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#define _SCHED_SIGNAL SIGPROF
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#endif
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/*
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* Priority queues.
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*
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* XXX It'd be nice if these were contained in uthread_priority_queue.[ch].
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*/
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typedef struct pq_list {
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TAILQ_HEAD(, pthread) pl_head; /* list of threads at this priority */
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TAILQ_ENTRY(pq_list) pl_link; /* link for queue of priority lists */
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int pl_prio; /* the priority of this list */
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int pl_queued; /* is this in the priority queue */
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} pq_list_t;
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typedef struct pq_queue {
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TAILQ_HEAD(, pq_list) pq_queue; /* queue of priority lists */
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pq_list_t *pq_lists; /* array of all priority lists */
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int pq_size; /* number of priority lists */
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} pq_queue_t;
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/*
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* TailQ initialization values.
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*/
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#define TAILQ_INITIALIZER { NULL, NULL }
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/*
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* Mutex definitions.
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*/
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union pthread_mutex_data {
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void *m_ptr;
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int m_count;
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};
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struct pthread_mutex {
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enum pthread_mutextype m_type;
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int m_protocol;
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TAILQ_HEAD(mutex_head, pthread) m_queue;
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struct pthread *m_owner;
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union pthread_mutex_data m_data;
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long m_flags;
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int m_refcount;
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/*
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* Used for priority inheritence and protection.
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*
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* m_prio - For priority inheritence, the highest active
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* priority (threads locking the mutex inherit
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* this priority). For priority protection, the
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* ceiling priority of this mutex.
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* m_saved_prio - mutex owners inherited priority before
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* taking the mutex, restored when the owner
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* unlocks the mutex.
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*/
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int m_prio;
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int m_saved_prio;
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/*
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* Link for list of all mutexes a thread currently owns.
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*/
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TAILQ_ENTRY(pthread_mutex) m_qe;
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/*
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* Lock for accesses to this structure.
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*/
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spinlock_t lock;
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};
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/*
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* Flags for mutexes.
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*/
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#define MUTEX_FLAGS_PRIVATE 0x01
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#define MUTEX_FLAGS_INITED 0x02
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#define MUTEX_FLAGS_BUSY 0x04
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/*
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* Static mutex initialization values.
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*/
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#define PTHREAD_MUTEX_STATIC_INITIALIZER \
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{ PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, TAILQ_INITIALIZER, \
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NULL, { NULL }, MUTEX_FLAGS_PRIVATE, 0, 0, 0, TAILQ_INITIALIZER, \
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_SPINLOCK_INITIALIZER }
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struct pthread_mutex_attr {
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enum pthread_mutextype m_type;
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int m_protocol;
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int m_ceiling;
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long m_flags;
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};
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/*
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* Condition variable definitions.
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*/
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enum pthread_cond_type {
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COND_TYPE_FAST,
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COND_TYPE_MAX
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};
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struct pthread_cond {
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enum pthread_cond_type c_type;
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TAILQ_HEAD(cond_head, pthread) c_queue;
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pthread_mutex_t c_mutex;
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void *c_data;
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long c_flags;
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/*
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* Lock for accesses to this structure.
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*/
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spinlock_t lock;
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};
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struct pthread_cond_attr {
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enum pthread_cond_type c_type;
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long c_flags;
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};
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/*
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* Flags for condition variables.
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*/
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#define COND_FLAGS_PRIVATE 0x01
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#define COND_FLAGS_INITED 0x02
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#define COND_FLAGS_BUSY 0x04
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/*
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* Static cond initialization values.
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*/
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#define PTHREAD_COND_STATIC_INITIALIZER \
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{ COND_TYPE_FAST, TAILQ_INITIALIZER, NULL, NULL, \
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0, _SPINLOCK_INITIALIZER }
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/*
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* Semaphore definitions.
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*/
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struct sem {
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#define SEM_MAGIC ((u_int32_t) 0x09fa4012)
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u_int32_t magic;
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pthread_mutex_t lock;
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pthread_cond_t gtzero;
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u_int32_t count;
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u_int32_t nwaiters;
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};
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/*
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* Cleanup definitions.
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*/
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struct pthread_cleanup {
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struct pthread_cleanup *next;
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void (*routine) ();
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void *routine_arg;
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};
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struct pthread_attr {
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int sched_policy;
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int sched_inherit;
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int sched_interval;
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int prio;
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int suspend;
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int flags;
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void *arg_attr;
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void (*cleanup_attr) ();
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void *stackaddr_attr;
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size_t stacksize_attr;
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};
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/*
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* Thread creation state attributes.
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*/
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#define PTHREAD_CREATE_RUNNING 0
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#define PTHREAD_CREATE_SUSPENDED 1
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/*
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* Miscellaneous definitions.
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*/
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#define PTHREAD_STACK_DEFAULT 65536
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/*
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* Size of red zone at the end of each stack. In actuality, this "red zone" is
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* merely an unmapped region, except in the case of the initial stack. Since
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* mmap() makes it possible to specify the maximum growth of a MAP_STACK region,
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* an unmapped gap between thread stacks achieves the same effect as explicitly
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* mapped red zones.
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*/
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#define PTHREAD_STACK_GUARD PAGE_SIZE
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/*
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* Maximum size of initial thread's stack. This perhaps deserves to be larger
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* than the stacks of other threads, since many applications are likely to run
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* almost entirely on this stack.
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*/
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#define PTHREAD_STACK_INITIAL 0x100000
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/* Address immediately beyond the beginning of the initial thread stack. */
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#define PTHREAD_DEFAULT_PRIORITY 64
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#define PTHREAD_MAX_PRIORITY 126
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#define PTHREAD_MIN_PRIORITY 0
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#define _POSIX_THREAD_ATTR_STACKSIZE
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/*
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* Clock resolution in nanoseconds.
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*/
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#define CLOCK_RES_NSEC 10000000
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/*
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* Time slice period in microseconds.
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*/
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#define TIMESLICE_USEC 100000
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struct pthread_key {
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spinlock_t lock;
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volatile int allocated;
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volatile int count;
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void (*destructor) ();
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};
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struct pthread_rwlockattr {
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int pshared;
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};
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struct pthread_rwlock {
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pthread_mutex_t lock; /* monitor lock */
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int state; /* 0 = idle >0 = # of readers -1 = writer */
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pthread_cond_t read_signal;
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pthread_cond_t write_signal;
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int blocked_writers;
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};
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/*
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* Thread states.
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*/
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enum pthread_state {
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PS_RUNNING,
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PS_SIGTHREAD,
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PS_MUTEX_WAIT,
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PS_COND_WAIT,
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PS_FDLR_WAIT,
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PS_FDLW_WAIT,
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PS_FDR_WAIT,
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PS_FDW_WAIT,
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PS_FILE_WAIT,
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PS_POLL_WAIT,
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PS_SELECT_WAIT,
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PS_SLEEP_WAIT,
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PS_WAIT_WAIT,
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PS_SIGSUSPEND,
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PS_SIGWAIT,
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PS_SPINBLOCK,
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PS_JOIN,
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PS_SUSPENDED,
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PS_DEAD,
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PS_DEADLOCK,
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PS_STATE_MAX
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};
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/*
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* File descriptor locking definitions.
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*/
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#define FD_READ 0x1
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#define FD_WRITE 0x2
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#define FD_RDWR (FD_READ | FD_WRITE)
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/*
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* File descriptor table structure.
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*/
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struct fd_table_entry {
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/*
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* Lock for accesses to this file descriptor table
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* entry. This is passed to _spinlock() to provide atomic
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* access to this structure. It does *not* represent the
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* state of the lock on the file descriptor.
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*/
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spinlock_t lock;
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TAILQ_HEAD(, pthread) r_queue; /* Read queue. */
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TAILQ_HEAD(, pthread) w_queue; /* Write queue. */
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struct pthread *r_owner; /* Ptr to thread owning read lock. */
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struct pthread *w_owner; /* Ptr to thread owning write lock. */
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char *r_fname; /* Ptr to read lock source file name */
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int r_lineno; /* Read lock source line number. */
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char *w_fname; /* Ptr to write lock source file name */
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int w_lineno; /* Write lock source line number. */
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int r_lockcount; /* Count for FILE read locks. */
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int w_lockcount; /* Count for FILE write locks. */
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int flags; /* Flags used in open. */
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};
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struct pthread_poll_data {
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int nfds;
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struct pollfd *fds;
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};
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union pthread_wait_data {
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pthread_mutex_t mutex;
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pthread_cond_t cond;
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const sigset_t *sigwait; /* Waiting on a signal in sigwait */
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struct {
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short fd; /* Used when thread waiting on fd */
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short branch; /* Line number, for debugging. */
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char *fname; /* Source file name for debugging.*/
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} fd;
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struct pthread_poll_data * poll_data;
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spinlock_t *spinlock;
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};
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/*
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* Define a continuation routine that can be used to perform a
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* transfer of control:
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*/
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typedef void (*thread_continuation_t) (void *);
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/*
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* Thread structure.
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*/
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struct pthread {
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/*
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* Magic value to help recognize a valid thread structure
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* from an invalid one:
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*/
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#define PTHREAD_MAGIC ((u_int32_t) 0xd09ba115)
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u_int32_t magic;
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char *name;
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u_int64_t uniqueid; /* for gdb */
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/*
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* Lock for accesses to this thread structure.
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*/
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spinlock_t lock;
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/* Queue entry for list of all threads: */
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TAILQ_ENTRY(pthread) tle;
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/* Queue entry for list of dead threads: */
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TAILQ_ENTRY(pthread) dle;
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|
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/*
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* Thread start routine, argument, stack pointer and thread
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* attributes.
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*/
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void *(*start_routine)(void *);
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void *arg;
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void *stack;
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struct pthread_attr attr;
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|
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#if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(__i386__)
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/*
|
|
* Saved floating point registers on systems where they are not
|
|
* saved in the signal context.
|
|
*/
|
|
char saved_fp[108];
|
|
#endif
|
|
|
|
/*
|
|
* Saved signal context used in call to sigreturn by
|
|
* _thread_kern_sched if sig_saved is TRUE.
|
|
*/
|
|
ucontext_t saved_sigcontext;
|
|
|
|
/*
|
|
* Saved jump buffer used in call to longjmp by _thread_kern_sched
|
|
* if sig_saved is FALSE.
|
|
*/
|
|
jmp_buf saved_jmp_buf;
|
|
jmp_buf *sighandler_jmp_buf;
|
|
|
|
/*
|
|
* Saved jump buffers for use when doing nested [sig|_]longjmp()s, as
|
|
* when doing signal delivery.
|
|
*/
|
|
union {
|
|
jmp_buf jmp;
|
|
sigjmp_buf sigjmp;
|
|
} nested_jmp;
|
|
int longjmp_val;
|
|
|
|
#define JMPFLAGS_NONE 0x00
|
|
#define JMPFLAGS_LONGJMP 0x01
|
|
#define JMPFLAGS__LONGJMP 0x02
|
|
#define JMPFLAGS_SIGLONGJMP 0x04
|
|
#define JMPFLAGS_DEFERRED 0x08
|
|
int jmpflags;
|
|
|
|
/*
|
|
* TRUE if the last state saved was a signal context. FALSE if the
|
|
* last state saved was a jump buffer.
|
|
*/
|
|
int sig_saved;
|
|
|
|
/*
|
|
* Used for tracking delivery of nested signal handlers.
|
|
*/
|
|
int signal_nest_level;
|
|
|
|
/*
|
|
* Cancelability flags - the lower 2 bits are used by cancel
|
|
* definitions in pthread.h
|
|
*/
|
|
#define PTHREAD_AT_CANCEL_POINT 0x0004
|
|
#define PTHREAD_CANCELLING 0x0008
|
|
#define PTHREAD_CANCEL_NEEDED 0x0010
|
|
int cancelflags;
|
|
|
|
int suspended;
|
|
|
|
thread_continuation_t continuation;
|
|
|
|
/*
|
|
* Current signal mask and pending signals.
|
|
*/
|
|
sigset_t sigmask;
|
|
sigset_t sigpend;
|
|
|
|
/* Thread state: */
|
|
enum pthread_state state;
|
|
enum pthread_state oldstate;
|
|
|
|
/* Time that this thread was last made active. */
|
|
struct timeval last_active;
|
|
|
|
/* Time that this thread was last made inactive. */
|
|
struct timeval last_inactive;
|
|
|
|
/*
|
|
* Number of microseconds accumulated by this thread when
|
|
* time slicing is active.
|
|
*/
|
|
long slice_usec;
|
|
|
|
/*
|
|
* Incremental priority accumulated by thread while it is ready to
|
|
* run but is denied being run.
|
|
*/
|
|
int inc_prio;
|
|
|
|
/*
|
|
* Time to wake up thread. This is used for sleeping threads and
|
|
* for any operation which may time out (such as select).
|
|
*/
|
|
struct timespec wakeup_time;
|
|
|
|
/* TRUE if operation has timed out. */
|
|
int timeout;
|
|
|
|
/*
|
|
* Error variable used instead of errno. The function __error()
|
|
* returns a pointer to this.
|
|
*/
|
|
int error;
|
|
|
|
/* Join queue head and link for waiting threads: */
|
|
TAILQ_HEAD(join_head, pthread) join_queue;
|
|
|
|
/*
|
|
* The current thread can belong to only one scheduling queue at
|
|
* a time (ready or waiting queue). It can also belong to (only)
|
|
* one of:
|
|
*
|
|
* o A queue of threads waiting for a mutex
|
|
* o A queue of threads waiting for a condition variable
|
|
* o A queue of threads waiting for another thread to terminate
|
|
* (the join queue above)
|
|
* o A queue of threads waiting for a file descriptor lock
|
|
* o A queue of threads needing work done by the kernel thread
|
|
* (waiting for a spinlock or file I/O)
|
|
*
|
|
* Use pqe for the scheduling queue link (both ready and waiting),
|
|
* and qe for other links.
|
|
*/
|
|
|
|
/* Priority queue entry for this thread: */
|
|
TAILQ_ENTRY(pthread) pqe;
|
|
|
|
/* Queue entry for this thread: */
|
|
TAILQ_ENTRY(pthread) qe;
|
|
|
|
/* Wait data. */
|
|
union pthread_wait_data data;
|
|
|
|
/*
|
|
* Allocated for converting select into poll.
|
|
*/
|
|
struct pthread_poll_data poll_data;
|
|
|
|
/*
|
|
* Set to TRUE if a blocking operation was
|
|
* interrupted by a signal:
|
|
*/
|
|
int interrupted;
|
|
|
|
/* Signal number when in state PS_SIGWAIT: */
|
|
int signo;
|
|
|
|
/*
|
|
* Set to non-zero when this thread has deferred signals.
|
|
* We allow for recursive deferral.
|
|
*/
|
|
int sig_defer_count;
|
|
|
|
/*
|
|
* Set to TRUE if this thread should yield after undeferring
|
|
* signals.
|
|
*/
|
|
int yield_on_sig_undefer;
|
|
|
|
/* Miscellaneous flags; only set with signals deferred. */
|
|
int flags;
|
|
#define PTHREAD_FLAGS_PRIVATE 0x0001
|
|
#define PTHREAD_EXITING 0x0002
|
|
#define PTHREAD_FLAGS_IN_CONDQ 0x0004 /* in condition queue using qe link*/
|
|
#define PTHREAD_FLAGS_IN_WORKQ 0x0008 /* in work queue using qe link */
|
|
#define PTHREAD_FLAGS_IN_WAITQ 0x0010 /* in waiting queue using pqe link */
|
|
#define PTHREAD_FLAGS_IN_PRIOQ 0x0020 /* in priority queue using pqe link */
|
|
#define PTHREAD_FLAGS_IN_MUTEXQ 0x0040 /* in mutex queue using qe link */
|
|
#define PTHREAD_FLAGS_IN_FILEQ 0x0080 /* in file lock queue using qe link */
|
|
#define PTHREAD_FLAGS_IN_FDQ 0x0100 /* in fd lock queue using qe link */
|
|
#define PTHREAD_FLAGS_TRACE 0x0200 /* for debugging purposes */
|
|
|
|
/*
|
|
* Base priority is the user setable and retrievable priority
|
|
* of the thread. It is only affected by explicit calls to
|
|
* set thread priority and upon thread creation via a thread
|
|
* attribute or default priority.
|
|
*/
|
|
char base_priority;
|
|
|
|
/*
|
|
* Inherited priority is the priority a thread inherits by
|
|
* taking a priority inheritence or protection mutex. It
|
|
* is not affected by base priority changes. Inherited
|
|
* priority defaults to and remains 0 until a mutex is taken
|
|
* that is being waited on by any other thread whose priority
|
|
* is non-zero.
|
|
*/
|
|
char inherited_priority;
|
|
|
|
/*
|
|
* Active priority is always the maximum of the threads base
|
|
* priority and inherited priority. When there is a change
|
|
* in either the base or inherited priority, the active
|
|
* priority must be recalculated.
|
|
*/
|
|
char active_priority;
|
|
|
|
/* Number of priority ceiling or protection mutexes owned. */
|
|
int priority_mutex_count;
|
|
|
|
/*
|
|
* Queue of currently owned mutexes.
|
|
*/
|
|
TAILQ_HEAD(, pthread_mutex) mutexq;
|
|
|
|
void *ret;
|
|
const void **specific_data;
|
|
int specific_data_count;
|
|
|
|
/* Cleanup handlers Link List */
|
|
struct pthread_cleanup *cleanup;
|
|
char *fname; /* Ptr to source file name */
|
|
int lineno; /* Source line number. */
|
|
};
|
|
|
|
/* Spare thread stack. */
|
|
struct stack {
|
|
SLIST_ENTRY(stack) qe; /* Queue entry for this stack. */
|
|
};
|
|
|
|
/*
|
|
* Global variables for the uthread kernel.
|
|
*/
|
|
|
|
/* Kernel thread structure used when there are no running threads: */
|
|
SCLASS struct pthread _thread_kern_thread;
|
|
|
|
/* Ptr to the thread structure for the running thread: */
|
|
SCLASS struct pthread * volatile _thread_run
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= &_thread_kern_thread;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Ptr to the thread structure for the last user thread to run: */
|
|
SCLASS struct pthread * volatile _last_user_thread
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= &_thread_kern_thread;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/*
|
|
* Ptr to the thread running in single-threaded mode or NULL if
|
|
* running multi-threaded (default POSIX behaviour).
|
|
*/
|
|
SCLASS struct pthread * volatile _thread_single
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* List of all threads: */
|
|
SCLASS TAILQ_HEAD(, pthread) _thread_list
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= TAILQ_HEAD_INITIALIZER(_thread_list);
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/*
|
|
* Array of kernel pipe file descriptors that are used to ensure that
|
|
* no signals are missed in calls to _select.
|
|
*/
|
|
SCLASS int _thread_kern_pipe[2]
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= {
|
|
-1,
|
|
-1
|
|
};
|
|
#else
|
|
;
|
|
#endif
|
|
SCLASS int volatile _queue_signals
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0;
|
|
#else
|
|
;
|
|
#endif
|
|
SCLASS int _thread_kern_in_sched
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Last time that an incremental priority update was performed: */
|
|
SCLASS struct timeval kern_inc_prio_time
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= { 0, 0 };
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Dead threads: */
|
|
SCLASS TAILQ_HEAD(, pthread) _dead_list
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= TAILQ_HEAD_INITIALIZER(_dead_list);
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Initial thread: */
|
|
SCLASS struct pthread *_thread_initial
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Default thread attributes: */
|
|
SCLASS struct pthread_attr pthread_attr_default
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= { SCHED_RR, 0, TIMESLICE_USEC, PTHREAD_DEFAULT_PRIORITY, PTHREAD_CREATE_RUNNING,
|
|
PTHREAD_CREATE_JOINABLE, NULL, NULL, NULL, PTHREAD_STACK_DEFAULT };
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Default mutex attributes: */
|
|
SCLASS struct pthread_mutex_attr pthread_mutexattr_default
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= { PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, 0, 0 };
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Default condition variable attributes: */
|
|
SCLASS struct pthread_cond_attr pthread_condattr_default
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= { COND_TYPE_FAST, 0 };
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/*
|
|
* Standard I/O file descriptors need special flag treatment since
|
|
* setting one to non-blocking does all on *BSD. Sigh. This array
|
|
* is used to store the initial flag settings.
|
|
*/
|
|
SCLASS int _pthread_stdio_flags[3];
|
|
|
|
/* File table information: */
|
|
SCLASS struct fd_table_entry **_thread_fd_table
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Table for polling file descriptors: */
|
|
SCLASS struct pollfd *_thread_pfd_table
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
SCLASS const int dtablecount
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 4096/sizeof(struct fd_table_entry);
|
|
#else
|
|
;
|
|
#endif
|
|
SCLASS int _thread_dtablesize /* Descriptor table size. */
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
SCLASS int _clock_res_nsec /* Clock resolution in nsec. */
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= CLOCK_RES_NSEC;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Garbage collector mutex and condition variable. */
|
|
SCLASS pthread_mutex_t _gc_mutex
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL
|
|
#endif
|
|
;
|
|
SCLASS pthread_cond_t _gc_cond
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL
|
|
#endif
|
|
;
|
|
|
|
/*
|
|
* Array of signal actions for this process.
|
|
*/
|
|
SCLASS struct sigaction _thread_sigact[NSIG];
|
|
|
|
/*
|
|
* Pending signals for this process.
|
|
*/
|
|
SCLASS sigset_t _process_sigpending;
|
|
|
|
/*
|
|
* Scheduling queues:
|
|
*/
|
|
SCLASS pq_queue_t _readyq;
|
|
SCLASS TAILQ_HEAD(, pthread) _waitingq;
|
|
|
|
/*
|
|
* Work queue:
|
|
*/
|
|
SCLASS TAILQ_HEAD(, pthread) _workq;
|
|
|
|
/* Tracks the number of threads blocked while waiting for a spinlock. */
|
|
SCLASS volatile int _spinblock_count
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0
|
|
#endif
|
|
;
|
|
|
|
/* Indicates that the signal queue needs to be checked. */
|
|
SCLASS volatile int _sigq_check_reqd
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0
|
|
#endif
|
|
;
|
|
|
|
/* Thread switch hook. */
|
|
SCLASS pthread_switch_routine_t _sched_switch_hook
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL
|
|
#endif
|
|
;
|
|
|
|
/*
|
|
* Spare stack queue. Stacks of default size are cached in order to reduce
|
|
* thread creation time. Spare stacks are used in LIFO order to increase cache
|
|
* locality.
|
|
*/
|
|
SCLASS SLIST_HEAD(, stack) _stackq;
|
|
|
|
/*
|
|
* Base address of next unallocated default-size {stack, red zone}. Stacks are
|
|
* allocated contiguously, starting below the bottom of the main stack. When a
|
|
* new stack is created, a red zone is created (actually, the red zone is simply
|
|
* left unmapped) below the bottom of the stack, such that the stack will not be
|
|
* able to grow all the way to the top of the next stack. This isn't
|
|
* fool-proof. It is possible for a stack to grow by a large amount, such that
|
|
* it grows into the next stack, and as long as the memory within the red zone
|
|
* is never accessed, nothing will prevent one thread stack from trouncing all
|
|
* over the next.
|
|
*/
|
|
SCLASS void * _next_stack
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
/* main stack top - main stack size - stack size - (red zone + main stack red zone) */
|
|
= (void *) USRSTACK - PTHREAD_STACK_INITIAL - PTHREAD_STACK_DEFAULT - (2 * PTHREAD_STACK_GUARD)
|
|
#endif
|
|
;
|
|
|
|
/* Used for _PTHREADS_INVARIANTS checking. */
|
|
SCLASS int _thread_kern_new_state
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0
|
|
#endif
|
|
;
|
|
|
|
/* Undefine the storage class specifier: */
|
|
#undef SCLASS
|
|
|
|
#ifdef _LOCK_DEBUG
|
|
#define _FD_LOCK(_fd,_type,_ts) _thread_fd_lock_debug(_fd, _type, \
|
|
_ts, __FILE__, __LINE__)
|
|
#define _FD_UNLOCK(_fd,_type) _thread_fd_unlock_debug(_fd, _type, \
|
|
__FILE__, __LINE__)
|
|
#else
|
|
#define _FD_LOCK(_fd,_type,_ts) _thread_fd_lock(_fd, _type, _ts)
|
|
#define _FD_UNLOCK(_fd,_type) _thread_fd_unlock(_fd, _type)
|
|
#endif
|
|
|
|
/*
|
|
* Function prototype definitions.
|
|
*/
|
|
__BEGIN_DECLS
|
|
char *__ttyname_basic(int);
|
|
char *__ttyname_r_basic(int, char *, size_t);
|
|
char *ttyname_r(int, char *, size_t);
|
|
int _find_dead_thread(pthread_t);
|
|
int _find_thread(pthread_t);
|
|
void _funlock_owned(pthread_t);
|
|
int _thread_create(pthread_t *,const pthread_attr_t *,void *(*start_routine)(void *),void *,pthread_t);
|
|
int _thread_fd_lock(int, int, struct timespec *);
|
|
int _thread_fd_lock_debug(int, int, struct timespec *,char *fname,int lineno);
|
|
void _dispatch_signals(void);
|
|
int _mutex_cv_lock(pthread_mutex_t *);
|
|
int _mutex_cv_unlock(pthread_mutex_t *);
|
|
void _mutex_notify_priochange(pthread_t);
|
|
int _mutex_reinit(pthread_mutex_t *);
|
|
void _mutex_unlock_private(pthread_t);
|
|
int _cond_reinit(pthread_cond_t *);
|
|
int _pq_alloc(struct pq_queue *, int, int);
|
|
int _pq_init(struct pq_queue *);
|
|
void _pq_remove(struct pq_queue *pq, struct pthread *);
|
|
void _pq_insert_head(struct pq_queue *pq, struct pthread *);
|
|
void _pq_insert_tail(struct pq_queue *pq, struct pthread *);
|
|
struct pthread *_pq_first(struct pq_queue *pq);
|
|
#if defined(_PTHREADS_INVARIANTS)
|
|
void _waitq_insert(pthread_t pthread);
|
|
void _waitq_remove(pthread_t pthread);
|
|
void _waitq_setactive(void);
|
|
void _waitq_clearactive(void);
|
|
#endif
|
|
void _thread_exit(char *, int, char *);
|
|
void _thread_exit_cleanup(void);
|
|
void _thread_fd_unlock(int, int);
|
|
void _thread_fd_unlock_debug(int, int, char *, int);
|
|
void _thread_fd_unlock_owned(pthread_t);
|
|
void *_thread_cleanup(pthread_t);
|
|
void _thread_cleanupspecific(void);
|
|
void _thread_dump_info(void);
|
|
void _thread_init(void);
|
|
void _thread_kern_sched(ucontext_t *);
|
|
void _thread_kern_sched_state(enum pthread_state,char *fname,int lineno);
|
|
void _thread_kern_sched_state_unlock(enum pthread_state state,
|
|
spinlock_t *lock, char *fname, int lineno);
|
|
void _thread_kern_set_timeout(struct timespec *);
|
|
void _thread_kern_sig_defer(void);
|
|
void _thread_kern_sig_undefer(void);
|
|
void _thread_sig_handler(int, int, ucontext_t *);
|
|
pthread_t _thread_sig_handle(int, ucontext_t *);
|
|
void _thread_sig_init(void);
|
|
void _thread_sig_send(pthread_t pthread, int sig);
|
|
void _thread_sig_deliver(pthread_t pthread, int sig);
|
|
void _thread_start(void);
|
|
void _thread_start_sig_handler(void);
|
|
void _thread_seterrno(pthread_t,int);
|
|
int _thread_fd_table_init(int fd);
|
|
pthread_addr_t _thread_gc(pthread_addr_t);
|
|
void _thread_enter_cancellation_point(void);
|
|
void _thread_leave_cancellation_point(void);
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void _thread_cancellation_point(void);
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/* #include <signal.h> */
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int _thread_sys_sigaction(int, const struct sigaction *, struct sigaction *);
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int _thread_sys_sigpending(sigset_t *);
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int _thread_sys_sigprocmask(int, const sigset_t *, sigset_t *);
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int _thread_sys_sigsuspend(const sigset_t *);
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int _thread_sys_siginterrupt(int, int);
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int _thread_sys_sigpause(int);
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int _thread_sys_sigreturn(ucontext_t *);
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int _thread_sys_sigstack(const struct sigstack *, struct sigstack *);
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int _thread_sys_sigvec(int, struct sigvec *, struct sigvec *);
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void _thread_sys_psignal(unsigned int, const char *);
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void (*_thread_sys_signal(int, void (*)(int)))(int);
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/* #include <sys/stat.h> */
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#ifdef _SYS_STAT_H_
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int _thread_sys_fchmod(int, mode_t);
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int _thread_sys_fstat(int, struct stat *);
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int _thread_sys_fchflags(int, u_long);
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#endif
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/* #include <sys/mount.h> */
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#ifdef _SYS_MOUNT_H_
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int _thread_sys_fstatfs(int, struct statfs *);
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#endif
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int _thread_sys_pipe(int *);
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/* #include <sys/socket.h> */
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#ifdef _SYS_SOCKET_H_
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int _thread_sys_accept(int, struct sockaddr *, int *);
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int _thread_sys_bind(int, const struct sockaddr *, int);
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int _thread_sys_connect(int, const struct sockaddr *, int);
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int _thread_sys_getpeername(int, struct sockaddr *, int *);
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int _thread_sys_getsockname(int, struct sockaddr *, int *);
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int _thread_sys_getsockopt(int, int, int, void *, int *);
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int _thread_sys_listen(int, int);
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int _thread_sys_setsockopt(int, int, int, const void *, int);
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int _thread_sys_shutdown(int, int);
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int _thread_sys_socket(int, int, int);
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int _thread_sys_socketpair(int, int, int, int *);
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ssize_t _thread_sys_recv(int, void *, size_t, int);
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ssize_t _thread_sys_recvfrom(int, void *, size_t, int, struct sockaddr *, int *);
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ssize_t _thread_sys_recvmsg(int, struct msghdr *, int);
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ssize_t _thread_sys_send(int, const void *, size_t, int);
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ssize_t _thread_sys_sendmsg(int, const struct msghdr *, int);
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ssize_t _thread_sys_sendto(int, const void *,size_t, int, const struct sockaddr *, int);
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#endif
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/* #include <stdio.h> */
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#ifdef _STDIO_H_
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FILE *_thread_sys_fdopen(int, const char *);
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FILE *_thread_sys_fopen(const char *, const char *);
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FILE *_thread_sys_freopen(const char *, const char *, FILE *);
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FILE *_thread_sys_popen(const char *, const char *);
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FILE *_thread_sys_tmpfile(void);
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char *_thread_sys_ctermid(char *);
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char *_thread_sys_cuserid(char *);
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char *_thread_sys_fgetln(FILE *, size_t *);
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char *_thread_sys_fgets(char *, int, FILE *);
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char *_thread_sys_gets(char *);
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char *_thread_sys_tempnam(const char *, const char *);
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char *_thread_sys_tmpnam(char *);
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int _thread_sys_fclose(FILE *);
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int _thread_sys_feof(FILE *);
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int _thread_sys_ferror(FILE *);
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int _thread_sys_fflush(FILE *);
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int _thread_sys_fgetc(FILE *);
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int _thread_sys_fgetpos(FILE *, fpos_t *);
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int _thread_sys_fileno(FILE *);
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int _thread_sys_fprintf(FILE *, const char *, ...);
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int _thread_sys_fpurge(FILE *);
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int _thread_sys_fputc(int, FILE *);
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int _thread_sys_fputs(const char *, FILE *);
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int _thread_sys_fscanf(FILE *, const char *, ...);
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int _thread_sys_fseek(FILE *, long, int);
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int _thread_sys_fsetpos(FILE *, const fpos_t *);
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int _thread_sys_getc(FILE *);
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int _thread_sys_getchar(void);
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int _thread_sys_getw(FILE *);
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|
int _thread_sys_pclose(FILE *);
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int _thread_sys_printf(const char *, ...);
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int _thread_sys_putc(int, FILE *);
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int _thread_sys_putchar(int);
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int _thread_sys_puts(const char *);
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int _thread_sys_putw(int, FILE *);
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int _thread_sys_remove(const char *);
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int _thread_sys_rename (const char *, const char *);
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int _thread_sys_scanf(const char *, ...);
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int _thread_sys_setlinebuf(FILE *);
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int _thread_sys_setvbuf(FILE *, char *, int, size_t);
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int _thread_sys_snprintf(char *, size_t, const char *, ...);
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int _thread_sys_sprintf(char *, const char *, ...);
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int _thread_sys_sscanf(const char *, const char *, ...);
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int _thread_sys_ungetc(int, FILE *);
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int _thread_sys_vfprintf(FILE *, const char *, _BSD_VA_LIST_);
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|
int _thread_sys_vprintf(const char *, _BSD_VA_LIST_);
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int _thread_sys_vscanf(const char *, _BSD_VA_LIST_);
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|
int _thread_sys_vsnprintf(char *, size_t, const char *, _BSD_VA_LIST_);
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|
int _thread_sys_vsprintf(char *, const char *, _BSD_VA_LIST_);
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|
int _thread_sys_vsscanf(const char *, const char *, _BSD_VA_LIST_);
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|
long _thread_sys_ftell(FILE *);
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|
size_t _thread_sys_fread(void *, size_t, size_t, FILE *);
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|
size_t _thread_sys_fwrite(const void *, size_t, size_t, FILE *);
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|
void _thread_sys_clearerr(FILE *);
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|
void _thread_sys_perror(const char *);
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|
void _thread_sys_rewind(FILE *);
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|
void _thread_sys_setbuf(FILE *, char *);
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|
void _thread_sys_setbuffer(FILE *, char *, int);
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|
#endif
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|
|
|
/* #include <unistd.h> */
|
|
#ifdef _UNISTD_H_
|
|
char *_thread_sys_ttyname(int);
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|
int _thread_sys_close(int);
|
|
int _thread_sys_dup(int);
|
|
int _thread_sys_dup2(int, int);
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|
int _thread_sys_exect(const char *, char * const *, char * const *);
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|
int _thread_sys_execve(const char *, char * const *, char * const *);
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|
int _thread_sys_fchdir(int);
|
|
int _thread_sys_fchown(int, uid_t, gid_t);
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|
int _thread_sys_fsync(int);
|
|
int _thread_sys_ftruncate(int, off_t);
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|
int _thread_sys_pause(void);
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|
int _thread_sys_pipe(int *);
|
|
int _thread_sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
|
|
off_t _thread_sys_lseek(int, off_t, int);
|
|
pid_t _thread_sys_fork(void);
|
|
pid_t _thread_sys_tcgetpgrp(int);
|
|
ssize_t _thread_sys_read(int, void *, size_t);
|
|
ssize_t _thread_sys_write(int, const void *, size_t);
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|
void _thread_sys__exit(int);
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|
#endif
|
|
|
|
/* #include <fcntl.h> */
|
|
#ifdef _SYS_FCNTL_H_
|
|
int _thread_sys_creat(const char *, mode_t);
|
|
int _thread_sys_fcntl(int, int, ...);
|
|
int _thread_sys_flock(int, int);
|
|
int _thread_sys_open(const char *, int, ...);
|
|
#endif
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|
|
|
/* #include <sys/ioctl.h> */
|
|
#ifdef _SYS_IOCTL_H_
|
|
int _thread_sys_ioctl(int, unsigned long, ...);
|
|
#endif
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|
|
|
/* #include <dirent.h> */
|
|
#ifdef _DIRENT_H_
|
|
DIR *___thread_sys_opendir2(const char *, int);
|
|
DIR *_thread_sys_opendir(const char *);
|
|
int _thread_sys_alphasort(const void *, const void *);
|
|
int _thread_sys_scandir(const char *, struct dirent ***,
|
|
int (*)(struct dirent *), int (*)(const void *, const void *));
|
|
int _thread_sys_closedir(DIR *);
|
|
int _thread_sys_getdirentries(int, char *, int, long *);
|
|
long _thread_sys_telldir(const DIR *);
|
|
struct dirent *_thread_sys_readdir(DIR *);
|
|
void _thread_sys_rewinddir(DIR *);
|
|
void _thread_sys_seekdir(DIR *, long);
|
|
#endif
|
|
|
|
/* #include <sys/uio.h> */
|
|
#ifdef _SYS_UIO_H_
|
|
ssize_t _thread_sys_readv(int, const struct iovec *, int);
|
|
ssize_t _thread_sys_writev(int, const struct iovec *, int);
|
|
#endif
|
|
|
|
/* #include <sys/wait.h> */
|
|
#ifdef WNOHANG
|
|
pid_t _thread_sys_wait(int *);
|
|
pid_t _thread_sys_waitpid(pid_t, int *, int);
|
|
pid_t _thread_sys_wait3(int *, int, struct rusage *);
|
|
pid_t _thread_sys_wait4(pid_t, int *, int, struct rusage *);
|
|
#endif
|
|
|
|
/* #include <poll.h> */
|
|
#ifdef _SYS_POLL_H_
|
|
int _thread_sys_poll(struct pollfd *, unsigned, int);
|
|
#endif
|
|
|
|
/* #include <sys/mman.h> */
|
|
#ifdef _SYS_MMAN_H_
|
|
int _thread_sys_msync(void *, size_t, int);
|
|
#endif
|
|
|
|
/* #include <setjmp.h> */
|
|
#ifdef _SETJMP_H_
|
|
extern void __siglongjmp(sigjmp_buf, int) __dead2;
|
|
extern void __longjmp(jmp_buf, int) __dead2;
|
|
extern void ___longjmp(jmp_buf, int) __dead2;
|
|
#endif
|
|
__END_DECLS
|
|
|
|
#endif /* !_PTHREAD_PRIVATE_H */
|